A Few Digitizing Comments

One thing that I noticed at the wedding reception was that the MP3s
sounded good over the PA system. Real good. So I'm thinking that they
probably weren't ripped at 128 kbps.

Personally, I encode everything at 192 kbps, and it stands to reason
that you might want to also if you're thinking about going into the music
for hire business.

Set the encoding quality in the iTunes preferences panel. You might also
want to go to the Advanced preferences and check the box, "Keep iTunes
Music folder organized." This will make it easy to find your MP3s on your
hard drive for creating playlists in other DJ
applications.

If you have Ogg Vorbis files that you want to add to your DJ playlist,
you can do so with a couple of minor adjustments. First, I recommend that
you download the OggVorbis.component from the QuickTime Components
Project. I've tested this component with QT 6.1.1, and it works
great. Add the component to your QuickTime Library
(System/Library/QuickTime), then launch the QT Player. (You might have to
change the permissions for the QuickTime folder before you're allowed to
drag in the component file.) Now you can play Ogg Vorbis tunes in
QuickTime, which also means that if you have the Pro version, you can
export to MPEG-4 audio. Both iTunes and Tactile12000 can play
MPEG-4s. You're in business!

If you want to work strictly in the Ogg Vorbis format because it is an
"open, patent-free, professional audio encoding and streaming technology
with all the benefits of Open Source," then there are a number of players that work on
Mac OS X. You can certainly rig a decent DJ setup using some of this
software and a little ingenuity. If you use the QuickTime Ogg component,
it also allows you to export other formats to .ogg.

Not only will the Ogg Vorbis QuickTime component allow you to play .ogg
files, you can rip to that format too.

The whole idea here, whether it be Ogg Vorbis, MP3, MPEG-4, or another
compressed format, is the ability to build vast music libraries on a
laptop instead of carting around hundreds of CDs. Once the files are in
the computer, it is so much easier to search for them, build playlists,
and adjust your program on the fly.

You could also spend lots of money doing this. The options I'm
presenting here are either free or very low cost. If you're a serious
audiophile, then this may seem like child's play to you. But if you're a
music lover with a sizable collection and a laptop, you might be able to
help out at the next big family party.

Speaking of the event itself, don't forget to sound check your setup
before the show starts. If you're using iTunes, work with its built in
equalizer to get "just the right sound" for the room. Have a helper stand
in different spots and signal to you while you adjust the EQ and
volume. Make sure you check the bass setting from the back of the room
where it will probably be the easiest to discern.

A handy piece of hardware for this type of work is the Griffin PowerMate
multimedia controller. The PowerMate provides you with a nice big metal
knob for volume control instead of using a mouse, or even worse, the
trackpad.

For events on a smaller scale, such as patio parties and hotel room
beer bashes, take a look at the Sony
SRS-T77 Folding Travel Speakers that are available at the Apple Store
for $79 US. These little guys put out 4 watts of power with a frequency
response of 100-20,000Hz. Yet the whole unit weights less than 13
ounces. The sound is great, and the gun metal gray and black design goes
perfectly with a TiBook. I used them at my last user group demo with 75
people in the room. The music reached the back of the room no
problem. After the session, I got more questions about the speakers than
the talk itself.

Don't be tempted by the less expensive SRS-T55s. They don't sound
nearly as good. Stick with the SRS-T77s, bring an extra set of AA
batteries, and with your OS X laptop you can power a party just about
anywhere.

Final Thoughts

Until just a few days ago, I'd never realized that a 1"-thick PowerBook
could replace the DJ's entire cart full of CDs and other
paraphernalia. DJs can now travel light and apply the power of Mac OS X to
their performances. I've only scratched the surface of this particular
vinyl subject, just enough to set your mind spinning. Let's crossfade this
conversation into the TalkBacks below.

Epilogue:

Going back to the iPod for a minute... I've come to appreciate
this little device even more when I travel long distances, such as the
flight to and from New Jersey for this last wedding. Seems like it never
runs out of juice, I always have music with me plus a couple Audible books
to fall back on, and it even becomes my timekeeper with its big
illuminated clock face that's easy to read in all conditions. It's 6 hours
flight time coming home in a headwind from the East Coast, so my Powerbook
battery tends to crap out during the home stretch. That's when I
discovered that Pong can actually be a lot of fun, even with a
thumbwheel. I'm pathetic though: my highest score on the last trip was a
dismal 136. I'm blaming it on air turbulence.